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Robust finite-time guidance against maneuverable targets with unpredictable evasive strategies

机译：针对无法预测的规避策略的机动目标提供鲁棒的限时制导

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This paper presents a robust finite-time guidance (RFTG) law to a short-range interception problem. The main challenge is that the evasive strategy of the target is unpredictable because it is determined not only by the states of both the interceptor and the target, but also by external un-modeled factors. By robustly stabilizing a line-of-sight rate, this paper proposes an integrated continuous finite-time disturbance observer/bounded continuous finite-time stabilizer strategy. The design of this integrated strategy has two points: 1) effect of a target maneuver is modeled as disturbance and then is estimated by the second-order homogeneous observer; 2) the finite-time stabilizer is actively coupled with the observer. Based on homogeneity technique, the local finite-time input-to-state stability is established for the closed-loop guidance system, thus implying the proposed RFTG law can quickly render the LOS rate within a bounded error throughout intercept. Moreover, convergence properties of the LOS rate in the presence of control saturation are discussed. Numerical comparison studies demonstrate the guidance performance. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：本文提出了一种鲁棒的有限时间制导（RFTG）定律，以解决短距离拦截问题。主要挑战在于，目标的规避策略是不可预测的，因为它不仅取决于拦截器和目标的状态，还取决于外部未建模的因素。通过稳固地稳定视线速率，本文提出了一种集成的连续有限时间干扰观测器/有界连续有限时间稳定器策略。这种综合策略的设计有两点：1）将目标机动的效果建模为干扰，然后由二阶齐次观测器进行估计； 2）有限时间稳定器主动与观察者耦合。基于均匀性技术，为闭环制导系统建立了局部有限状态输入到状态的稳定性，从而表明所提出的RFTG定律可以在整个拦截过程中快速将LOS率呈现在有界误差内。此外，讨论了存在控制饱和时LOS速率的收敛特性。数值比较研究表明了制导性能。 （C）2018 Elsevier Masson SAS。版权所有。

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